/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package a.annotation.proguard.classfile.attribute.annotation;

import proguard.classfile.*;
import proguard.classfile.attribute.annotation.visitor.ElementValueVisitor;
import proguard.classfile.visitor.ClassVisitor;

/**
 * Representation of an annotation.
 *
 * @author Eric Lafortune
 */
public class Annotation implements VisitorAccepter {
    public int u2typeIndex;
    public int u2elementValuesCount;
    public ElementValue[] elementValues;

    /**
     * An extra field pointing to the Clazz objects referenced in the type string. This field is typically filled out by
     * the <code>{@link
     * proguard.classfile.util.ClassReferenceInitializer
     * ClassReferenceInitializer}</code>. References to primitive types are ignored.
     */
    public Clazz[] referencedClasses;

    /**
     * An extra field in which visitors can store information.
     */
    public Object visitorInfo;

    /**
     * Creates an uninitialized Annotation.
     */
    public Annotation() {}

    /**
     * Creates an initialized Annotation.
     */
    public Annotation(int u2typeIndex, int u2elementValuesCount, ElementValue[] elementValues) {
        this.u2typeIndex = u2typeIndex;
        this.u2elementValuesCount = u2elementValuesCount;
        this.elementValues = elementValues;
    }

    /**
     * Returns the type.
     */
    public String getType(Clazz clazz) {
        return clazz.getString(u2typeIndex);
    }

    /**
     * Applies the given visitor to the first referenced class. This is the main annotation class.
     */
    public void referencedClassAccept(ClassVisitor classVisitor) {
        if (referencedClasses != null) {
            Clazz referencedClass = referencedClasses[0];
            if (referencedClass != null) {
                referencedClass.accept(classVisitor);
            }
        }
    }

    /**
     * Applies the given visitor to all referenced classes.
     */
    public void referencedClassesAccept(ClassVisitor classVisitor) {
        if (referencedClasses != null) {
            for (int index = 0; index < referencedClasses.length; index++) {
                Clazz referencedClass = referencedClasses[index];
                if (referencedClass != null) {
                    referencedClass.accept(classVisitor);
                }
            }
        }
    }

    /**
     * Applies the given visitor to all element value pairs.
     */
    public void elementValuesAccept(Clazz clazz, ElementValueVisitor elementValueVisitor) {
        for (int index = 0; index < u2elementValuesCount; index++) {
            elementValues[index].accept(clazz, this, elementValueVisitor);
        }
    }

    // Implementations for VisitorAccepter.

    public Object getVisitorInfo() {
        return visitorInfo;
    }

    public void setVisitorInfo(Object visitorInfo) {
        this.visitorInfo = visitorInfo;
    }
}
